JP2011104619A - Method of forming of panel composite - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of forming a panel composite, by which fixing strength is raised by preventing relative positional deviation between both panels while securing the design quality of an outer panel. <P>SOLUTION: The panel composite 1 is made by superimposing the outer panel 10 and an inner panel 20 each other, and a sandwiching part 30 where the peripheral part 21 of the inner panel 20 is sandwiched between the peripheral part 11 of the outer panel 10 and its adjacent region 12 is formed by turning up the peripheral part 11 of the outer panel 11 on the side of the inner panel 20, on the periphery. The panel composite 1 is formed at least through a superimposing step where the peripheral part 11 of the outer panel 10 and the peripheral part 21 of the inner panel 20 are superimposed on each other in the crossing direction, a welding step where both peripheral parts 11, 21 are joined by applying welding to both superimposed peripheral parts 11, 21 and a bending step where the sandwiching part 30 is formed by bending both joined peripheral parts 11, 21 integrally on the side of the inner panel 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for forming a panel composite, and in particular, with the outer panel and the inner panel being overlapped, the outer panel is bent to the inner panel side, thereby sandwiching the outer panel with the outer panel. The present invention relates to a technology for forming a panel composite that exhibits a morphological form.

  As one of methods for forming a panel composite in which a plurality of panel members are overlapped, a method using a so-called hemming process is known. This processing method is mainly intended to reinforce panel composites and improve design quality. For example, automotive door panels, bonnets (hoods), roof panels, etc. Used in products (parts) that require quality.

  Here, a method of forming the panel composite by hemming will be described by taking, for example, a method disclosed in Patent Document 1 below as an example. As shown in FIG. That is, in a state where the outer panel 110 and the inner panel 120 are overlapped, a preliminary bending process and then a final bending process are performed on the flange portion 111 that is erected in advance on the periphery of the outer panel 110. Specifically, as shown in FIG. 6 (a), the flange portion 111 that is bent in advance on the periphery of the outer panel 110 is preliminarily bent until a predetermined inclination angle is obtained (FIG. 6 (a)). (To the position indicated by the one-dot chain line in the figure), the flange portion 111 which is folded back to the predetermined inclination angle as shown in FIG. The peripheral portion 121 is sandwiched between the flange portion 111 of the folded outer panel 110 and its adjacent region 112 by folding back until it comes into contact with the peripheral portion 121. As a result, a sandwiching portion (hemming coupling portion 130) is formed between the outer panel 110 and the inner panel 120 that are overlapped with each other.

  In addition, in Patent Document 1 below, as shown in FIG. 7, an adhesive 140 in which hard particles 141 such as glass beads are mixed in advance in a region that becomes a hemming joint 130 between the outer panel 110 and the inner panel 120. By disposing the above-described hemming process, the hard particles 141 are engaged with the surface of the outer panel 110, and the hemming joint 130 is reinforced by the frictional force generated by the engagement. ing.

JP 2001-286952 A

  As disclosed in the above-mentioned Patent Document 1, an adhesive is usually applied to the sandwiching portion for the purpose of rust prevention and sealing while combining both panels. However, the bond strength (adhesive strength) of this type of adhesive is manifested in processing after the panel composite is formed (for example, a baking and drying step in electrodeposition coating of the panel surface). Therefore, if a large load or vibration is applied to the panel composite due to transportation or transfer until the two panels are completely joined, relative displacement occurs between the two panels, resulting in reduced strength or design quality. There is a risk of lowering.

  In this regard, for example, in the hemming processing method disclosed in Patent Document 1 described above, for the purpose of preventing the displacement, the adhesive 140 mixed with hard particles 141 such as glass beads is supplied to the region to be the hemming joint 130, In addition, the hard particles 141 mixed in the adhesive 140 are bitten into the surface of the outer panel 110 by pressurizing the region serving as the hemming joint 130 from the inner panel 120 side before the preliminary bending process or during the main bending process. (See FIG. 7). However, it is difficult to suppress the relative displacement that occurs between the two panels before the adhesive is solidified only by the biting action of the hard particles.

  As another misalignment prevention means, for example, a method of spot welding the sandwiched portion after hemming (the hemming joint portion 130 shown in FIG. 6 (b) in Patent Document 1) can be considered. For such panel-shaped workpieces, as represented by direct welding, it is common to perform welding by sandwiching and pressurizing the welded portion with a pair of electrodes and energizing. Therefore, when the welding is performed, indentations due to the electrodes are inevitably left on the outer surface of the outer panel, which becomes the design surface, and there is a concern that the design quality may be deteriorated.

  In order to avoid the formation of indentation due to electrode pressing, indirect welding such as series welding is also conceivable, but welding conditions are set in order to apply pressurization by pressing the electrode only from the inner panel side. However, there are problems that are difficult and time-consuming. Further, as shown in FIG. 6B, the sandwiched portion (hemming coupling portion 130) is a peripheral portion 121 of the inner panel 120 between the flange portion 111 of the outer panel 110 folded back to the inner panel 120 side and its adjacent region 112. In the case of presenting a form sandwiched between, i.e., when the welded part is in a three-layered state, it is difficult to produce the required energized state in indirect welding, and an appropriate welded part (joined part) may not be formed There is. Alternatively, as shown in FIG. 7, when the adhesive 140 is interposed between the peripheral portion 121 of the inner panel 120 and the outer panel 110, the pressing force by the electrodes is absorbed, so that the flange of the outer panel 110 is There is a problem that it is difficult to sufficiently pressurize the portion 111, and there is a possibility that an appropriate joint portion cannot be formed.

  In view of the above circumstances, the present specification provides a method for forming a panel composite that can ensure the design quality of the outer panel and prevent the relative displacement between the two panels and increase its fixing strength. This is a technical problem to be solved by the present invention.

  The present invention has been made to solve the above problems. That is, the method for forming a panel composite according to the present invention is such that the outer panel and the inner panel are overlapped with each other by bending the outer panel edge to the inner panel side so that the outer panel edge is aligned with the outer panel edge. In the panel composite forming method for forming the sandwiched portion sandwiched between the outer peripheral portion and the adjacent region thereof, a superimposing step of superimposing the peripheral edge portion of the outer panel and the peripheral edge portion of the inner panel in a mutually crossing direction, It is characterized in that it includes a welding process in which both peripheral parts are joined by welding the part, and a bending process in which a sandwiched part is formed by folding both joined peripheral parts to the inner panel side.

  As described above, the present invention eliminates the conventional hemming process, overlaps the peripheral portions of both panels in a manner different from the conventional one, and bends both peripheral portions to the inner panel side, thereby providing both panels. It has a feature in that the peripheral portion of can be fixed by welding. That is, according to the above-described method, before performing the bending process for forming the sandwiched portion, both the peripheral portions of the inner panel and the outer panel are overlapped in advance and the overlapped portion is welded. The peripheral part of the panel is integrated. In addition, since these peripheral portions are integrated in a state where they are overlapped with each other, the peripheral portions of the inner panel can be joined while the peripheral portions are joined to each other by simply folding the integrated peripheral portions to the inner panel side. A portion (sandwich portion) sandwiched between the peripheral portion of the outer panel and its adjacent region can be formed. As a result, it is possible to firmly fix both panels without waiting for the expression of the fixing force by the adhesive, and in the process after forming the panel composite, the relative displacement between the panels occurs. Can be prevented. Further, since only the peripheral edge of the outer panel and the peripheral edge of the inner panel are fixed by welding, there is no possibility that the above-described welding failure occurs. Therefore, sufficient bonding strength can be obtained between both panels regardless of the presence or absence of the adhesive. In addition, since welding between the panels is performed before the inner panel peripheral edge is sandwiched between the outer panel peripheral edge and the adjacent area, welding marks are formed on the outer surface of the outer panel (exactly, the outer surface of the adjacent area). Will not remain. Thereby, the quality of the design surface of the panel composite can be ensured.

  In this case, a portion recessed toward the outer panel side may be provided in a region adjacent to the peripheral portion of the inner panel so that the bending of both peripheral portions may be guided in the bending step.

  By comprising in this way, at the time of a bending process, the both peripheral parts integrated by welding can be easily bend | folded to the inner panel side by the recessed part provided in the inner panel. Further, when the region adjacent to the peripheral edge of the inner panel is deformed along with the bending deformation, the side close to the adjacent region of the recess also deforms in the direction of opening the recess following the deformation. Thereby, the surface shape of the inner panel after a bending process can be made into the shape connected smoothly from the peripheral part to the panel base end side.

  In addition, the welding process for both peripheral parts includes various welding means such as spot welding and means for continuously forming a welded part (joined part) along the longitudinal direction of the peripheral part of the kind called mushroom welding. It can be adopted. Here, when considering application of spot welding with high versatility, since only two peripheral portions of both panels are fixed by welding, it is possible to apply either direct welding or indirect welding. Indirect welding is applied when it is difficult to place electrodes on the inner side of the overlapped peripheral edges, that is, on the peripheral edge of the inner panel, such as by welding the peripheral edges of both panels over the entire circumference. It is also possible to do. In this case, one of the pair of electrodes used for the welding is placed outside the peripheral edge of the outer panel, and the other is placed in a predetermined position on the inner panel using the positioning hole of the inner panel. May be performed.

  For example, in the case of a panel composite such as a door panel, the inner panel is often provided with positioning holes in various processing steps and assembly steps. Therefore, by arranging the other electrode (for example, ground electrode) at a predetermined position on the inner panel using this type of hole, the distance between the electrodes can be kept constant in each welding operation. Conditions can be easily set in a short time.

  As described above, according to the manufacturing method of the present invention, it is possible to prevent the relative displacement between the two panels and increase the fixing strength while ensuring the design quality of the outer panel. In addition, it is possible to manufacture a panel composite having an external shape having high positional accuracy and shape accuracy and excellent design properties while having a required fixing strength.

It is principal part sectional drawing of the panel composite_body | complex which concerns on one Embodiment of this invention. It is a figure for demonstrating the manufacturing process of the panel composite body shown in FIG. 1, Comprising: It is principal part sectional drawing for demonstrating notionally the overlapping process of the peripheral part of both panels. It is a figure for demonstrating the manufacturing process of the panel composite body shown in FIG. 1, Comprising: It is principal part sectional drawing for demonstrating notionally the welding process of the both panel peripheral part piled up mutually. It is a figure for demonstrating the manufacturing process of the panel composite body shown in FIG. 1, Comprising: Both the peripheral parts integrated by welding are bend | folded to the inner panel side, and the process for forming a clamping part notionally It is principal part sectional drawing. It is a principal part expanded sectional view which shows the modification of the formation process of a clamping part. It is a figure for demonstrating the formation procedure of the clamping part by the conventional hemming process, Comprising: (a) is principal part sectional drawing for demonstrating conceptually the preliminary bending process with respect to the flange part of an outer panel, (b). These are principal part sectional drawings for demonstrating notably the main bending process with respect to the flange part of an outer panel. It is sectional drawing of the panel composite body which formed the clamping part by the conventional hemming process, Comprising: It is sectional drawing of a panel composite body when an adhesive agent is interposed between the peripheral part of an inner panel, and an outer panel.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a panel composite forming method according to the present invention and an embodiment of a panel composite formed by this method will be described with reference to the drawings.

  FIG. 1: has shown principal part sectional drawing of the panel composite body 1 which concerns on one Embodiment of this invention. The panel composite 1 shown in this figure is mainly formed by superposing an outer panel 10 and an inner panel 20 on each other. As shown in FIG. By folding back to the panel 20 side, a portion (nip portion 30) is formed in which the peripheral portion 21 of the inner panel 20 is sandwiched between the peripheral portion 11 of the outer panel 10 and its adjacent region 12. Here, the peripheral edge portion 11 of the outer panel 10 and the peripheral edge portion 21 of the inner panel 20 that are overlapped with each other are joined by welding as will be described later. Moreover, while the adjacent area | region 12 adjacent to the peripheral part 11 of the outer panel 10 is exhibiting the form which pinched | interposed the peripheral part 21 of the inner panel 20 with the peripheral part 11 of the outer panel 10, what is this peripheral part 21? They face each other without being joined by welding. In this embodiment, an adhesive 40 is interposed between the peripheral portion 21 of the inner panel 20 and the adjacent region 12 of the outer panel 10 that mainly faces the peripheral portion 21 and in the back thereof. Thus, the peripheral edge portion 21 of the inner panel 20 and the adjacent region 12 of the outer panel 10 are bonded and fixed. In addition, in this embodiment, although only the structure in the one cross section of the panel composite 1 is disclosed, the said clamping part 30 may be formed over the whole region of the peripheral part 21 of the inner panel 20, and the peripheral part 21 Of course, it may be formed over a partial region.

  The panel composite body 1 having the above-described configuration is welded to the overlapping step of overlapping the peripheral edge portion 11 of the outer panel 10 and the peripheral edge portion 21 of the inner panel 20 in different directions, and the overlapping peripheral edge portions 11 and 21. Thus, it is formed through at least a welding process for joining the peripheral edge parts 11 and 21, and a bending process for forming the sandwiched part 30 by bending the joined peripheral edge parts 11 and 21 integrally to the inner panel 20 side. Is done. Hereinafter, an example of a process for forming the panel composite 1 will be described with reference to FIGS.

  First, as shown in FIG. 2, as the outer panel 10, the peripheral edge portion 11 of the adjacent region 12 (or the outer panel 10 main body including the adjacent region 12) is on the inner panel 20 side (in FIG. 2, the figure). Prepare an upright stand. Also, the inner panel 20 is prepared by bending the peripheral edge portion 21 toward the outer panel 10 with respect to the adjacent region 22 (or the inner panel 20 main body including the adjacent region 22). And while combining the outer panel 10 and the inner panel 20 of the said form, the peripheral part 11 of the outer panel 10 is located in the outer side of the peripheral part 21 of the inner panel 20 in the said combined state, and it faces each other and crosses. Superimpose in the direction (superposition process). In this case, as shown in FIG. 2, a predetermined gap may be left between the peripheral portions 11 and 21. This is because they are brought into contact with each other in the subsequent welding process. In this embodiment, the adjacent region 12 (or the main body of the outer panel 10) of the peripheral edge portion 11 of the outer panel 10 is provided so that the peripheral edge portions 11 and 21 are smoothly overlapped with the combination work of both the panels 10 and 20. Is set to be larger than 90 degrees. Note that the adhesive 40 shown in FIG. 1 may be applied to the inner surface of the adjacent region 12 of the outer panel 10 at the time up to this overlapping step, but in FIG. 2 and FIGS. Drawing of the adhesive is omitted in order to explain mainly the processing other than the bonding.

  Further, in this embodiment, as shown in FIG. 2, bending guidance is performed in an adjacent region 22 that is continuous with the proximal end side of the peripheral portion 21 of the inner panel 20 and extends away from the outer panel 10 as the distance from the peripheral portion 21 increases. A recess 23 is provided. The concave portion 23 is continuously provided in the circumferential direction corresponding to a circumferential region in which the sandwiching portion 30 between the outer panel 10 and the inner panel 20 is formed from the functional side.

  In this way, after the peripheral portions 11 and 21 of both panels 10 and 20 are overlapped, welding is performed on the peripheral portions 11 and 21 in the overlapped state (welding process). In this embodiment, indirect welding as spot welding is performed on both peripheral edge portions 11 and 21 at a plurality of locations in the longitudinal direction. FIG. 3 is a diagram for explaining the outline of the welding process, in which both peripheral edge portions 11 and 21 are added to the outer surface of the peripheral edge portion 11 of the outer panel 10 among the peripheral edge portions 11 and 21 to be welded. A welding electrode 51 is formed in contact with each other to form a joint 50 by applying pressure. On the outer surface of the inner panel 20 (surface opposite to the outer panel 10 side), a ground electrode 52 that acts as a ground with respect to the welding electrode 51 is disposed. Each of the electrodes 51 and 52 is electrically connected to a current control device (not shown) via a welding transformer 54, and a current supplied from a power source (not shown) is also supplied to the welding electrode 51 via the welding transformer 54. It is comprised so that it can flow with a desired electricity supply pattern with respect to (both peripheral edge parts 11 and 21). In this embodiment, as shown in FIG. 3, a positioning pin portion 53 is formed on the work contact surface (the lower surface in FIG. 3) of the ground electrode 52, and this pin portion 53 is formed on the inner surface. The ground electrode 52 is brought into contact with a predetermined position of the inner panel 20 by being fitted into a positioning hole 24 provided in the panel 20 main body.

  From the state where both electrodes 51 and 52 are placed in contact with the work (peripheral portion 11 and inner panel 20 main body) with a predetermined distance between them as described above, both peripheral portions 11 and 21 are connected to the inner by welding electrode 51. Pressurization is performed toward the panel 20, and energization is started between the welding electrode 51 and the ground electrode 52 when the applied pressure reaches a predetermined applied pressure. Accordingly, the peripheral portions 11 and 21 to the peripheral portions 11 and 21 are heated, and a predetermined joint portion 50 is formed between the peripheral portions 11 and 21. At this time, depending on the magnitude of the applied pressure of the welding electrode 51, the peripheral edge portions 11 and 21 are generally on the inner panel 20 side as compared with the state before welding as shown by the broken lines in FIG. Although joining may occur in a state of being pushed and bent, in the subsequent folding step, both peripheral edge portions 11 and 21 are bent in the same direction, so that there is no problem in being pushed and bent particularly at this stage.

  Then, the sandwiched portion 30 shown in FIG. 1 is formed by subjecting the peripheral edge portions 11 and 21 joined as described above to a predetermined bending process (bending step). Specifically, as shown in FIG. 4, the peripheral edge portion 21 of the inner panel 20 is joined to the peripheral edge portion 21 by bending both peripheral edge portions 11 and 21 in a state of being joined together to the inner panel 20 side. A sandwiching portion 30 sandwiched between the peripheral edge portion 11 of the outer panel 10 to be fixed and its adjacent region 12 is formed, whereby the panel composite 1 shown in FIG. 1 is formed.

  As described above, according to the method for forming a panel composite according to the present invention, the peripheral edges 11 and 21 are joined together, and the peripheral edge 21 of the inner panel 20 is replaced with the peripheral edge 11 of the outer panel 10 and its adjacent region. 12 can be formed. Therefore, regardless of the presence or absence of the adhesive, the panels 10 and 20 can be firmly fixed by the bonding force of the joint 50, and in the process after the panel composite 1 is formed, It is possible to prevent a situation in which a general misalignment occurs. Further, since the welded joint between the peripheral edge portion 11 of the outer panel 10 and the peripheral edge portion 21 of the inner panel 20 is performed before the sandwiched portion 30 is formed by bending (see FIGS. 3 and 4), It is not necessary to leave a welding mark on the outer surface of the adjacent region 12 of the panel 10. Thereby, the quality of the design surface of the panel composite body 1 can be ensured.

  Moreover, in this embodiment, since the recessed part 23 for bending guidance was previously provided in the adjacent area | region 22 adjacent to the peripheral part 21 of the inner panel 20, an inner panel is accompanied with the said bending deformation of both the peripheral parts 11 and 21. The 20 adjacent regions 22 are relatively easily deformed so as to warp so as to protrude toward the outer panel 10 from the recessed portion 23 (from the broken line position to the solid line position in FIG. 4). Therefore, the bending process can be performed with a relatively small force, and the shape of the inner panel 20 after the bending process can be smoothly connected from the peripheral edge 21 toward the panel base end side. Thereby, it is possible to ensure the design surface quality inside the panel composite 1.

  As mentioned above, although one Embodiment of the formation method of the panel composite_body | complex concerning this invention was described, this manufacturing method can take arbitrary forms within the scope of this invention, without being limited to the form of the said illustration.

  In the above-described embodiment, the bending process is continued after the welding process. However, before this folding process, for example, as shown in FIG. By irradiating a heating medium such as a laser (plasma, gas, high frequency, etc.) from a heat source such as the laser device 60, the part 23 serving as a starting point of the bending may be heated to a predetermined temperature. . By this heating operation, the portion 23 that is the starting point of the bending is softened by heating, and therefore it is possible to reliably bend the peripheral edge portions 11 and 21 toward the inner panel 20 from the portion 23 in the subsequent bending step. . In addition, when performing the bending process of both the peripheral parts 11 and 21 accompanied with said heating operation | movement, although illustration is abbreviate | omitted concretely, for example, both peripheral parts 11 and 21 are mutually on a flat support stand. The laser device 60 shown in FIG. 5 is placed along the longitudinal direction of the peripheral portions 11 and 21 with the outer panel 10 and inner panel 20 (see FIG. 5) bonded and fixed to each other. While being moved, the laser is irradiated to a portion 23 that is located at the lower end of the peripheral edge 11 slightly above the adjacent region 12 and serves as a starting point of bending. The roller hem or the like is moved along the longitudinal direction so as to follow the region softened by the laser irradiation from the laser device 60 in the portion 23 serving as the starting point of the bending (following the laser device 60). By pressing and rolling, the sandwiched portion 30 shown in FIG. 1 can be continuously formed along the longitudinal direction of the peripheral edge portions 11 and 21.

  In addition, regarding the overlapping process of the peripheral edge portions 11 and 21, FIG. 2 illustrates the case where the peripheral edge portion 11 of the outer panel 10 is erected in a state of being opened more than 90 degrees with respect to the adjacent region 12. Of course, it may be erected at an angle of 90 degrees or less. In short, as shown in the figure, with the combination work of the outer panel 10 and the inner panel 20, the peripheral portion 21 of the inner panel 20 is located inside the peripheral portion 11 of the outer panel 10, and the directions cross each other. As long as they overlap with each other, the angle is arbitrary. For example, the peripheral edge portion 11 may be arranged in parallel with the adjacent region 12, that is, in a state opened 180 degrees. In the subsequent folding process, it is sufficient to bend the inner panel 20 by about 180 degrees.

  Moreover, since the fixing force between both the panels 10 and 20 is ensured by the welding joining of both the peripheral parts 11 and 21, it is not necessary to use an adhesive like FIG. In that case, the adjacent region 12 of the outer panel 10 and the peripheral edge 21 of the inner panel 20 may be in contact with each other, and may be opposed to each other with a predetermined interval (see FIG. 4). In addition, when the peripheral edge portions 11 and 21 are fixed over the entire circumferential direction by welding, it is not necessary to use an adhesive as a sealing agent. However, when spot welding is used, bonding is performed as shown in FIG. The agent 40 may be interposed.

  With the panel composite forming method according to the above description, a panel composite that is very excellent in terms of strength as well as design and shape accuracy (assembly accuracy) can be obtained. The present invention can be applied to the manufacture of various panel-like parts such as automobile door panels, bonnets (hoods), and roof panels that are often used.

  Of course, other specific forms can be adopted for matters other than the above as long as the technical significance of the present invention is not lost.

1 panel composite 10 outer panel 11 peripheral edge (outer panel)
12 Adjacent area (outer panel)
20 Inner panel 21 Peripheral edge (inner panel)
22 Adjacent area (inner panel)
23 Concave portion 23 Site to be bent 24 Positioning hole 30 Clamping portion 40 Adhesive 50 Joint portion 51 Welding electrode 52 Ground electrode 60 Laser device 110 Outer panel 111 Flange portion 112 Adjacent region 120 Inner panel 121 Peripheral portion 130 Hemming coupling Part 140 Adhesive 141 Hard particles

Claims (3)

A sandwiching portion in which a peripheral portion of the outer panel is folded between the peripheral portion of the outer panel and its adjacent region by bending the peripheral portion of the outer panel to the inner panel side in a state where the outer panel and the inner panel are overlapped. In the method of forming the panel composite to form
A superimposing step of superimposing a peripheral edge portion of the outer panel and a peripheral edge portion of the inner panel in directions different from each other;
A welding step of joining the peripheral edges by welding the overlapped peripheral edges;
And a bending step of forming the sandwiched portion by bending both the joined peripheral edge portions to the inner panel side.   The region adjacent to the peripheral portion of the inner panel is provided with a concave portion toward the outer panel, thereby guiding the bending of the peripheral portions in the bending step. A method for forming the panel composite as described.   In the welding process, one of the pair of electrodes is disposed outside the outer peripheral edge of the outer panel, and the other is pressed in a state of being disposed at a predetermined position of the inner panel using the positioning hole of the inner panel. The method for forming a panel composite according to claim 1, wherein energization is performed.

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